Hi All,
I am trying to call C++ Callback functions from JavaScript on Webkit. I
have added code for that as mentioned in the attached file. i am able to
call the registered APIs from normal html page but when i redirect or reload
with a new page I am unable to call the C++ apis from JS, I am getting
undefined function. Please find the attached source file and Could you
please suggest me how can I create a Java Script object and which can be
called every time new page is loaded. Could you please suggest me ?
Please find the attached source code and sample html.
Thanks,
Anil.V
Title: Test
COLOR KEY 1
/*
* Copyright (C) 2006, 2007 Apple Inc.
* Copyright (C) 2007 Alp Toker <a...@atoker.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gtk/gtk.h>
#include <webkit/webkit.h>
#include <JavaScriptCore/JavaScript.h>
static GtkWidget* main_window;
static GtkWidget* uri_entry;
static GtkStatusbar* main_statusbar;
static WebKitWebView* web_view;
static WebKitWebFrame* frame;
static gchar* main_title;
static gint load_progress;
static guint status_context_id;
static guint height,width;
/* */
typedef unsigned short uint16;
typedef short int16;
typedef unsigned char uint8;
typedef char int8;
struct jsfunreg_s
{
const char *JSFunName;
/* Java Script CallBack function */
JSValueRef (*JsCallbackFun)(JSContextRef js_context, JSObjectRef js_function, JSObjectRef js_this, size_t argument_count ,const JSValueRef js_arguments[] ,JSValueRef* js_exception);
};
/* Definitions of all callback functions which will be executed when we call the registered java script functions */
static JSValueRef GPlay_Cb(JSContextRef js_context,
JSObjectRef js_function,
JSObjectRef js_this,
size_t argument_count,
const JSValueRef js_arguments[],
JSValueRef* js_exception)
{
return js_value;
}
static const struct jsfunreg_s JSFunReg[]={
{"Play",GPlay_Cb}
};
/* Registers given JSFunName as a Function like standard java api */
static void
RegJSFunction( unsigned int jsreg_index )
{
/* Variable declaration for Plugin code */
WebKitWebFrame* web_frame;
JSGlobalContextRef js_context;
JSObjectRef js_global;
JSStringRef js_function_name;
JSObjectRef js_set_can_register;
web_frame = webkit_web_view_get_main_frame (WEBKIT_WEB_VIEW (web_view));
js_context = webkit_web_frame_get_global_context (web_frame);
js_global = JSContextGetGlobalObject (js_context);
js_function_name = JSStringCreateWithUTF8CString ( JSFunReg[ jsreg_index ].JSFunName );
js_set_can_register = JSObjectMakeFunctionWithCallback (js_context,js_function_name, (JSObjectCallAsFunctionCallback)JSFunReg[ jsreg_index ].JsCallbackFun);
JSObjectSetProperty (js_context, js_global, js_function_name, js_set_can_register, kJSPropertyAttributeNone, NULL);
JSStringRelease (js_function_name);
/* End of addition */
}
static void
activate_uri_entry_cb (GtkWidget* entry, gpointer data)
{
const gchar* uri = gtk_entry_get_text (GTK_ENTRY (entry));
g_assert (uri);
webkit_web_view_load_uri (web_view, uri);
}
static void
update_title (GtkWindow* window)
{
GString* string = g_string_new (main_title);
g_string_append (string, " - WebKit Launcher");
if (load_progress < 100)
g_string_append_printf (string, " (%d%%)", load_progress);
gchar* title = g_string_free (string, FALSE);
gtk_window_set_title (window, title);
g_free (title);
}
static void
link_hover_cb (WebKitWebView* page, const gchar* title, const gchar* link, gpointer data)
{
/* underflow is allowed */
gtk_statusbar_pop (main_statusbar, status_context_id);
if (link)
gtk_statusbar_push (main_statusbar, status_context_id, link);
}
static void
title_change_cb (WebKitWebView* web_view, WebKitWebFrame* web_frame, const gchar* title, gpointer data)
{
if (main_title)
g_free (main_title);
main_title = g_strdup (title);
update_title (GTK_WINDOW (main_window));
}
static void
progress_change_cb (WebKitWebView* page, gint progress, gpointer data)
{
load_progress = progress;
update_title (GTK_WINDOW (main_window));
}
static void
load_commit_cb (WebKitWebView* page, WebKitWebFrame* frame, gpointer data)
{
const gchar* uri = webkit_web_frame_get_uri(frame);
if (uri)
gtk_entry_set_text (GTK_ENTRY (uri_entry), uri);
}
static void
destroy_cb (GtkWidget* widget, gpointer data)
{
gtk_main_quit ();
}
static void
go_back_cb (GtkWidget* widget, gpointer data)
{
webkit_web_view_go_back (web_view);
}
static void
go_forward_cb (GtkWidget* widget, gpointer data)
{
webkit_web_view_go_forward (web_view);
}
static GtkWidget*
create_browser ()
{
GtkWidget* scrolled_window = gtk_scrolled_window_new (NULL, NULL);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
web_view = WEBKIT_WEB_VIEW (webkit_web_view_new ());
gtk_container_add (GTK_CONTAINER (scrolled_window), GTK_WIDGET (web_view));
g_signal_connect (G_OBJECT (web_view), "title-changed", G_CALLBACK (title_change_cb), web_view);
g_signal_connect (G_OBJECT (web_view), "load-progress-changed", G_CALLBACK (progress_change_cb), web_view);
g_signal_connect (G_OBJECT (web_view), "load-committed", G_CALLBACK (load_commit_cb), web_view);
g_signal_connect (G_OBJECT (web_view), "hovering-over-link", G_CALLBACK (link_hover_cb), web_view);
return scrolled_window;
}
static GtkWidget*
create_statusbar ()
{
main_statusbar = GTK_STATUSBAR (gtk_statusbar_new ());
status_context_id = gtk_statusbar_get_context_id (main_statusbar, "Link Hover");
return (GtkWidget*)main_statusbar;
}
static GtkWidget*
create_toolbar ()
{
GtkWidget* toolbar = gtk_toolbar_new ();
gtk_toolbar_set_orientation (GTK_TOOLBAR (toolbar), GTK_ORIENTATION_HORIZONTAL);
gtk_toolbar_set_style (GTK_TOOLBAR (toolbar), GTK_TOOLBAR_BOTH_HORIZ);
GtkToolItem* item;
/* the back button */
item = gtk_tool_button_new_from_stock (GTK_STOCK_GO_BACK);
g_signal_connect (G_OBJECT (item), "clicked", G_CALLBACK (go_back_cb), NULL);
gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, -1);
/* The forward button */
item = gtk_tool_button_new_from_stock (GTK_STOCK_GO_FORWARD);
g_signal_connect (G_OBJECT (item), "clicked", G_CALLBACK (go_forward_cb), NULL);
gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, -1);
/* The URL entry */
item = gtk_tool_item_new ();
gtk_tool_item_set_expand (item, TRUE);
uri_entry = gtk_entry_new ();
gtk_container_add (GTK_CONTAINER (item), uri_entry);
g_signal_connect (G_OBJECT (uri_entry), "activate", G_CALLBACK (activate_uri_entry_cb), NULL);
gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, -1);
/* The go button */
item = gtk_tool_button_new_from_stock (GTK_STOCK_OK);
g_signal_connect_swapped (G_OBJECT (item), "clicked", G_CALLBACK (activate_uri_entry_cb), (gpointer)uri_entry);
gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, -1);
return toolbar;
}
static GtkWidget*
create_window ()
{
GtkWidget* window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
if ( width > 0 && height > 0 )
gtk_window_set_default_size (GTK_WINDOW (window), width, height);
else
gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
gtk_widget_set_name (window, "GtkLauncher");
g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy_cb), NULL);
return window;
}
int
main (int argc, char* argv[])
{
unsigned int jsfun_count=0;
gtk_init (&argc, &argv);
if (!g_thread_supported ())
g_thread_init (NULL);
if( argc > 3)
{
if ( argv[2] )
width = atoi(argv[2] );
if ( argv[3] )
height = atoi(argv[3] );
}
else
{
width = 0;
height = 0;
}
GtkWidget* vbox = gtk_vbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), create_toolbar (), FALSE, FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), create_browser (), TRUE, TRUE, 0);
gtk_box_pack_start (GTK_BOX (vbox), create_statusbar (), FALSE, FALSE, 0);
main_window = create_window ();
gtk_container_add (GTK_CONTAINER (main_window), vbox);
gchar* uri = (gchar*) (argc > 1 ? argv[1] : "http://www.google.com/";);
webkit_web_view_load_uri (web_view, uri);
gtk_widget_grab_focus (GTK_WIDGET (web_view));
gtk_widget_show_all (main_window);
/* Customized code */
for ( jsfun_count=0; jsfun_count < ( ( sizeof( JSFunReg ) ) / ( sizeof(JSFunReg[0] ) )); jsfun_count++ )
{
RegJSFunction(jsfun_count);
}
gtk_main ();
return 0;
}
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